Risa uses rods and buttons to form figures that follow a pattern. The first four figures are shown.
- The table shows the number of rods and buttons Risa used to each figure. Complete the table for Figure 9 (i) and (ii). Give your answers in the following format. (Eg 1, 2)
- A figure in the pattern has a total of 156 buttons. What is the figure number of that pattern?
- How many rods are there in Figure 12?
(a)
Number of rods:
Figure Number 1: 1 + 1 x 2 = 3
Figure Number 2: 1 + 2 x 2 = 5
Figure Number 3: 1 + 3 x 2 = 7
Figure Number 4: 1 + 4 x 2 = 9
Formula:
Number of rods = 1 + Figure Number x 2
Number of buttons:
Figure Number 1: 2 + 1 = 3
Figure Number 2: 2 + 2 = 4
Figure Number 3: 2 + 3 = 5
Figure Number 4: 2 + 4 = 6
Formula:
Number of buttons = 2 + Figure Number
Number of rods for Figure 9
= 1 + 9 x 2
= 19
Number of buttons for Figure 9
= 2 + 9
= 11
(b)
2 + Figure Number = 156
Figure Number = 156 - 2
Figure Number = 154
Figure Number that has a total of 156 buttons: 154
(c)
Number of rods in Figure 12
= 1 + 12 x 2
= 1 + 24
= 25
Answer(s): (a) 19, 11 ; (b) 154; (c) 25